Steam turbines; a practical and theoretical treatise for engineers and students, including a discussion of the gas turbine . w of steam into the nozzles canbe controlled. It is thus possible to close some of the nozzleson light loads and obtain nearly as good efficiency and steamconsumption as at full load. The method is the same as ex-plained for De Laval turbines on page 144. The governor of thecentrifugal throttling type is shown at the extreme right-handend of the turbine shaft. It is one of the type with weightsacting on knife edges, in principle somewhat like the De Lavalgovernor (Figs.
Steam turbines; a practical and theoretical treatise for engineers and students, including a discussion of the gas turbine . w of steam into the nozzles canbe controlled. It is thus possible to close some of the nozzleson light loads and obtain nearly as good efficiency and steamconsumption as at full load. The method is the same as ex-plained for De Laval turbines on page 144. The governor of thecentrifugal throttling type is shown at the extreme right-handend of the turbine shaft. It is one of the type with weightsacting on knife edges, in principle somewhat like the De Lavalgovernor (Figs. 160 and 161). Like other parts of this turbine 262 THE STEAM TURBINE it is made as simple as possible, consisting of very few parts asshown in Fig. 147. The main bearings have solid linings of phosphor are of the self-aligning, ring-oiling type. The weight onthese bearings never exceeds 14 pounds per square inch of bear-ing surface. The speed of these turbines is from 1600 to 3000 revolutionsper minute. These low speed limits compared with the speedsof single-stage De Laval turbines are made possible by the. Fig. 147. The Parts of a Sturtevant Governor. application of the velocity stage principle in the use of thereversing buckets. Fig. 148 is an illustration of a Sturtevant turbine direct-con-nected to a ventilating fan or blower. The governor mechanismis at the left-hand end. Valves for closing nozzles to adjust thesteam supply to the load, to get the best efficiency of the nozzlesand blades, are shown clearly outside the casing. The deep base which the small diameter of this turbine neces-sitates, is utilized for steam chambers, to which the main admis-sion and exhaust steam piping is connected. Overhead pipesare in this way eliminated. COMMERCIAL TYPES 263 The bucket wheel is a single forging of open hearth steel, andas the buckets are cut out of the solid metal, a wheel of greatstrength is secured. Blade breakage and striking are elimi-nated, because if the buc
Size: 2153px × 1161px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyorkwiley, books
